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SSRN 2024年

作者： Ghosh, Tushar K. Pragya, Akanksha Young, Natalie Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University RaleighNC27606 United States Fiber and Polymer Science Program Wilson College of Textiles North Carolina State University RaleighNC27695 United States

Fabrication of lightweight composites using thermally responsive expandable microspheres (EM) embedded in an elastomeric matrix to form syntactic foams offers significant opportunities to create functional and structural composites for diverse applications. The morphology of the EM-elastomer composite on the micro- and macro-scales is significantly influenced by the fabrication sequence and parameters (composition, expansion time/temperature, etc.). Herein, we report the morphological evolution of an EM-elastomer composite through the fabrication processes and elucidate the interaction of relevant fabrication parameters. Unlike the majority of published reports on hard EM composites, the in-situ expansion of the closed-cell foam structure within a soft matrix leads to larger void sizes, and the concomitant expansive force of the EM impacts the polymer chain mobility within the soft composite. At the same time, higher EM loading improves the mechanical properties;the evolved microstructure leads to a lightweight but stiff structure. For the first time, the report details the thermal expansion of EM under applied pretension, which leads to irreversible prestrain-dependent morphological changes toward anisotropic mechanical properties. Additionally, the composites are shaped under constrained expansion. The study provides a comprehensive guide and expands the pathways for the practical application of EM-embedded soft syntactic foams in aerospace, electronics, wearables, robotics, etc. © 2024, The Authors. All rights reserved.

关键词： Elastomers

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Bicomponent vascular grafts consisting of synthetic absorbable fibers: Part II: In vivo healing response

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Journal of Investigative Surgery 1994年第3期7卷 195-211页

作者： Yu, Tarng-Jenn Ho, Donald M. Chu, C.C. Section of Cardiovascular Surgery Department of Surgery Veterans General Hospitals-Taipei Institute of Biomedical Engineering Yang-Ming Medical College Shih-Pai Taipei Taiwan Department of Pathology Veterans General Hospitals-Taipei Shih-Pai Taipei Taiwan Department of Textiles and Apparel Cornell University Ithaca NY United States Fiber and Polymer Science Program Department of Textiles and Apparel Cornell University Ithaca NY 14853-4401 United States

The objectives of this research were (I) to determine whether the use of partially absorbable vascular grafts would improve their nonthrombogenic performance and whether they are more prone to aneurysmal dilation and subsequent failure in vivo. and (2) to find out the relationships, if any. between these in vivo and the previously reported in vitro data with an emphasis on how the in vitro changes in fabric structure and properties related to these in vivo data. Bicomponent vascular fabrics were made from Dacron and polyglycolic acid (PGA) yarns with a range of composition ratios of the PGA to Dacron. Both woven and single Jersey knit fabrics were made, and implanted in dogs for 4 months. The following findings and relationships were obtained. (1) The bicomponent vascular fabrics resulted in a full-wall healing in the thoracic aorta of dogs. All bicomponent vascular grafts in survived dogs exhibited 100% patency, no thrombus or aneurysmal formation, no hematoma or seroma around the grafts, and no fibrin coagula in the inner capsules. The gross morphology of the regenerated tissues was very similar visually to the adjacent original arterial tissue. Histologically, the luminal surface was lined with a layer of endothelial cells with myofibroblasts, fibroblasts. and collagens underneath. (2) The extent of the full-wall healing depended on the type of fabric structure. the concentration of absorbable yarns, the location of absorbable yarns (for the woven group only), and initial water permeability. It is believed that the concentration effect was related to the level of macrophage activation from the degradation products of the absorbable yarns, while the location effect was attributed to the various types of fabric structure change on the degradation of the absorbable yarns. (3) In general, the knitted group (K), was better than the woven group (W). K3 showed the best in vivo performance in the knitted group. (4) In the woven group, W3 was the best. The incorporation o

关键词： Absorbable fibers Animal implantation Biodegradation Endothelial cell lining Synthetic vascular grafts Tissue ingrowth

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Atmospheric Pressure Plasma-Electrospinning Hybrid Process

Atmospheric Pressure Plasma-Electrospinning Hybrid Process

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The 12th Asian textile Conference (第12届亚洲纺织会议暨2013年纺织学术年会)

作者： Xiangwu Zhang Marian G.McCord Mohamed A.Bourham Quan Shi Narendiran Vitchuli Joshua Nowak Fiber and Polymer Science Program College of Textiles North Carolina State University Raleigh USA Department of Nuclear Engineering North Carolina State University Raleigh USA

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Processing and characterization of liquid crystalline copoly-(ethylene terephthalate-co-2(3)-chloro-1,4-phenyleneterephthalate)/polycarbonate blends

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fibers and polymers 2001年第3期2卷 129-134页

作者： Rhee, Do Mook Ha, Wan Shik Youk, Ji Ho Yoo, Dong Il Department of Textile Engineering Chonnam National University Puk-ku Kwangju 500-757 300 Yongbong-dong South Korea Samyang Group Central R and D Center Yusung-ku Taejeon 305-348 63-2 Hwaam-dong South Korea Department of Fiber and Polymer Science Seoul National University Kwanak-ku Seoul 151-742 Shinlim-dong South Korea Department of Chemistry University of Alabama at Birmingham Birmingham AL 35294-1240 United States

Liquid crystalline (LC) poly(ethylene terephthalate-co-2(3)-chloro-1,4- phenylene terephthalate) (50/50, mole/ mole) [PECPT] was synthesized and blended with polycarbonate (PC). LC properties of PECPT and thermal, morphological, and rheological behaviors of the PECPT/PC blend were studied. PECPT showed the nematic LC phase and much longer relaxation time than poly(ethylene terephthalate) (PET). The apparent melt viscosity of PECPT was one third of that of PET. An, abrupt torque change was observed during the blending process due to the orientation of LC domains. For the blends containing 10-30 wt% of PECPT, the complex viscosities were higher than that of PC. As PECPT content increases above 40 wt%, shear thinning was observed. The lowest complex viscosity was obtained at 40-50 wt%. Transesterification of PECPT and PC was confirmed by the selective chemical degradation of carbonate groups in PC.

关键词： Blend Morphology PC PECPT Rheological property Transesterification

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A diatrizoic acid derivative for N -acylation of amino acids

Results in Chemistry

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Results in Chemistry 2025年 16卷

作者： Kousaku Ohkawa Hemdeep Kaur Tracy Nguyen Beatrice Mae Malvar Rebecca Back Chloe Jin Parisa Khosropour Shuichi Suzuki Frank P.K. Hsu Ichiro Yuki Division of Synthetic Polymers Institute of High Polymer Research Faculty of Textile Science and Technology Shinshu University Tokida 3-15-1 Ueda 386-8567 Japan Division of Bibliometrics and Social Implementation Institute for Fiber Engineering Interdisciplinary Cluster for Cutting Edge Research Shinshu University Tokida 3-15-1 Ueda 386-8567 Japan Department of Neurological Surgery University of California Irvine 200S Manchester St. Suite 210 Orange CA92868 USA AquaTeX Medical Inc. Irvine CA92617 USA Department of Neurosurgery The Jikei University Hospital 3 Chome-25-8 Nishi-Shinbashi Minato City Tokyo 105-8461 Japan

3,5-Bis(acetamido)-2,4,6-triiodobenzoic acid, aka diatrizoic acid (DTZOH), is a major compound for the radiopaque material research. Iodine elements at the 2,4,6-positions are the origin of the radiopacity, but the bulkiness of iodine frequently inhibits the nucleophilic attack to the 1-carboxylic carbon, resulting in a low yield when DTZOH is used as an acylation agent. In this study, the authors hypothesized that the 1-carboxylic oxygen is utilized as a nucleophile because of its freedom from iodine-shielding. The base-catalyzed esterification using tert -butyl α -bromoacetate and DTZOH formed the diatrizoyloxyacetic acid tert -butyl ester (DTZAc-O t Bu) and subsequent removal of the t Bu group using trifluoroacetic acid yielded the diatrizoyloxyacetic acid (DTZAcOH) in quantitative yield. Acylation of the primary amino groups of the β -alanine ethyl ester or N α - tert -butyloxycarbonyl- l -lysine tert -butyl ester using isobutyl chloroformate were satisfactory in about 85 mol% yields. Conformer search calculations suggested that among the three classes of condensation reagents, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide monohydrochloride, 1,1′-cabonyldimidazole, and isobutyl chloroformate, the mixed anhydride generated by the condensation of DTZAcOH and isobutyl chloroformate has the highest freedom in the nucleophile approach direction and the lowest hindrance to the nucleophilic center. DTZAcOH is a feasible acylating agent of primary amino groups and inspires new designs of the functional X-ray shielding materials.

关键词： Diatrizoic acid derivatives N-acylation of amino acid derivatives Conformer search calculation

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Electrospinning and electrospun nanofibers: From academic research to industrial production

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Progress in Materials science 2025年 154卷

作者： Wang, Ce Wang, Wei Qi, Hongxu Dai, Yunqian Jiang, Shaohua Ding, Bin Wang, Xianfeng Li, Congju Zeng, Jinfeng Wu, Tong Li, Haoyi Wang, Yuanfei Zhao, Yong Wang, Wenli Li, Zhenyu Mo, Xiumei Hou, Haoqing Dong, Lijie Ma, Hongyang Liu, Yong Su, Chunlei Bai, Jie Wu, Weiwei Guo, Gang Nie, Guangdi Wang, Nü Zhu, Han Bai, Jing Fang, Jian Liang, Daxin Ba, Zhichen Han, Guangping Lu, Xiaofeng Wang, Kaizhong Zhang, Xiaoyong Kang, Weimin Deng, Nanping Hu, Wei Chen, Weihua Zhang, Xiuling Yang, Dongzhi Wang, Fengyun Bian, Ye Liu, Zi'ang Zhang, Liang Li, Xiang Li, Lei Li, Yongxin Huang, Hui Jia, Xiaoteng Li, Xiaofeng Yang, Daxiang Jin, Xianchang Li, Shiyang Zhang, Xindan Tang, Nan Hao, Ruinan Tian, Feng Mai, Liqiang Wei, Yen Xue, Jiajia Alan G. MacDiarmid Institute Jilin University Changchun130012 China Harbin Institute of Technology Harbin150001 China Tsinghua University Beijing100084 China Southeast University Nanjing211189 China Nanjing Forestry University Nanjing210037 China Donghua University Shanghai201620 China Qingdao University Qingdao266071 China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Qingdao Stomatological Hospital Affiliated to Qingdao University Qingdao260001 China School of Chemistry Beihang University Beijing100191 China College of Textile and Clothing Engineering Jiangsu Engineering Research Center of Textile Dyeing and Finishing for Energy Conservation Discharge Reduction and Cleaner Production National Engineering Laboratory for Morden Silk Soochow University Suzhou215123 China Southwest Petroleum University Chegdu610500 China Jiangxi Normal University Nanchang330022 China Wuhan University of Technology Wuhan430070 China Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Inner Mongolia University of Technology Hohhot010051 China Xidian University Xian710071 China Sichuan University Chengdu610065 China Beihang University Beijing100191 China Jiangnan University Wuxi214122 China Northeast Forestry University Harbin150040 China Jilin University Changchun130012 China First Hospital of Jilin University Changchun130031 China Nanchang University Nanchang330031 China Tiangong University Tianjin300387 China Northeast Normal University Changchun130024 China Zhengzhou University Zhengzhou450001 China University of Science and Technology Beijing Beijing100083 China Co. Ltd. Chongqing404617 China Beijing Guo Wei Na Research Center for Fiber Materials Beijing China Shanghai University Shanghai200444 China South China University of Technology Guangzhou510006 China State Key Laboratory of Advanced Technology for Materials Synthesis and Pr

Electrospinning is a versatile and rapidly evolving technique that has gained significant attention for its ability to produce nanofibers with unique structures and properties. Over the past few decades, the scope of electrospun nanofibers has expanded from simple polymer fibers to more complex composites and ceramics, enabling a wide range of applications across fields such as environmental protection, biomedical engineering, energy storage, and smart materials. This review provides a comprehensive overview of recent advancements, covering material selection, process optimization, and innovative applications. We discuss the unique structural features of electrospun nanofibers, including their tunable diameters, porous architectures, and diverse compositions, which underpin their multifunctionality. Key applications are highlighted in areas including environmental protection and safety, biomedical engineering, energy storage and conversion, and catalysis, as well as emerging uses in flexible electronics, advanced engineering materials, and textiles. Additionally, we review state-of-the-art characterization techniques and discuss the challenges and opportunities involved in scaling up industrial production. Finally, we offer a forward-looking perspective on the future of electrospun nanofibers, emphasizing the need for continued innovation in both academic research and commercial applications. © 2025 Elsevier Ltd

关键词： Medical applications

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Nondestructive damage sensitivity and reinforcing effect of functionalized carbon nanotube and nanofiber/epoxy composites using electro-micromechanical techniques

Nondestructive damage sensitivity and reinforcing effect of ...

引用

2004 MRS Fall Meeting

作者： Park, Joung-Man Jung, Jin-Kyu Kim, Sung-Ju Kim, Dae-Sik Lee, Jae-Rock Kim, Tae-Wook Department of Polymer Science and Engineering Engineering Research Institute Gyeongsang National University Jinju 660-701 Korea Republic of Fiber Science Program Cornell University Ithaca NY 14853-4401 United States Advanced Materials Division Korea Research Institute of Chemical Technology Yusong Taejeon 305-600 Korea Republic of Composite Materials Group Korea Institute of Machinery and Materials Chanwon 641-010 Korea Republic of

Nondestructive damage sensing and load transfer mechanisms of thermal treated carbon nanotube (CNT) and nanofiber (CNF)/epoxy composites were investigated using electromicromechanical technique. Carbon black (CB) was used only for the comparison. Electromicromechanical techniques were applied to obtain the fiber damage and stress transferring effect of carbon nanocomposites with their contents. Thermal treatment and temperature affected on apparent modulus and electrical properties on nanocomposites due to enhanced inherent properties of each CNMs. Coefficient of variation (COV) of volumetric electrical resistance can be used to obtain the dispersion degree indirectly for various CNMs. Dispersion and surface modification are very important parameters to obtain improved mechanical and electrical properties of CNMs for multifunctional applications. Further optimized functionalization and dispersion conditions will be investigated for the following work continuously. © 2005 Materials Research Society.

关键词： Carbon nanotubes

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Novel Atmospheric plasma enhanced Silk Fibroin nanofiber/Gauze composite wound dressings

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Journal of fiber Bioengineering and Informatics 2012年第3期5卷 227-242页

作者： Nawalakhe, Rupesh Shi, Quan Vitchuli, Narendiran Bourham, Mohamed A. Zhang, Xiangwu Mccord, Marian G. Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC 27695-8301 United States Department of Nuclear Engineering North Carolina State University Raleigh NC 27695-7909 United States Joint Department of Biomedical Engineering North Carolina State University Raleigh NC 27695-7115 United States University of North Carolina Chapel Hill NC 27599 United States

In this work, Silk Fibroin (SF) nanofibers were electrospun onto plasma-treated 100% cotton gauze bandages to form a novel silk-gauze composite wound dressing. Atmospheric pressure plasma pre- and post- treatments were used to increase the adhesion between the SF nanofibers and cotton substrates. The adhesion of the nanofibers to the substrates was assessed by qualitative and quantitative techniques. Plasma pre-treatment of the substrate with 100% helium and 99% helium/1% oxygen plasmas showed up to a 50% increase in the force required to peel off the nanofiber layer. This force was further increased up to 75% after pre- as well as post-plasma treatment of the composite bandages. Plasma pre-treatment of the gauze fabric prior to nanofiber deposition and post-treatment to the composite bandages significantly reduced degradation of the nanofiber layer during repetitive flexing. Air permeability and moisture vapor transport were significantly reduced due to the presence of a nanofiber layer upon the substrate. The results of surface elemental analysis showed that the adhesion and durability increase are mainly due to the active species generated by plasma on the surface of cotton substrate as well as on the surface of the silk fibroin nanofibers. © 2012 Binary Information Press & textile Bioengineering and Informatics Society.

关键词： Adhesion

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Relationships between antithrombogenicity and surface free energy of regenerated silk fibroin films

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fibers and polymers 2001年第2期2卷 58-63页

作者： Park, Won Ho Ha, Wan Shik Ito, Hiraku Miyamoto, Takeaki Inagaki, Hiroshi Noishiki, Yasuharu Department of Textile Engineering Chungnam National University Taejon Korea Department of Fiber and Polymer Science Seoul National University Seoul Korea Saint Agnes’ Junior College Osaka Japan Institute for Chemical Research Kyoto University Uji Kyoto Japan First Department of Surgery School of Medicine Yokohama City University Yokohama Japan

Silk fibroin (SF) was dissolved in calcium chloride/ethanol/water mixture (1/2/8 in mole ratio) at 70°C for 4 h. The dissolved silk fibroin was regenerated by casting the dialyzed solution into the films. The films were treated with 50% aqueous solution of methanol for different times, and their antithrombogenicity was evaluated byin vitro andin vivo *** vivo blood tests were made by a method of peripheral vein indwelling suture. It was found that the silk fibroin had a good anti-thrombogenicity and an absorbability even though the polymer showed foreign body reaction. Finally, the blood compatibilty of silk fibroin films which were subjected to structural change by the methanol treatment, was examined in connection with their interfacial surface energy, and a correlation between these properties was found to be present.

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Formation of metal complex in a poly(hydroxamic acid) resin bead

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fibers and polymers 2001年第1期2卷 13-17页

作者： Lee, Taek Seung Jeon, Dong Won Kim, Jai Kyeong Hong, Sung Il Organic & Optoelectronic Materials Lab. Department of Textile Engineering Chungnam National University Taejon Korea Department of Clothing and Textiles Ewha Womans University Seoul Korea Electronic Materials and Devices Research Center Korea Institute of Science and Technology Cheongryang Seoul Korea Department of Fiber and Polymer Science Seoul National University Seoul Korea

Poly(hydroxamic acid) resin beads were prepared and complexed with various metal ions. We used IR spectroscopy to investigate the structure of metal complex. It proved that the products formed by introduction of metal ions gave stable and colored complex. It was found that the resin bead as synthesized would be a good column packing material for continuous extraction. Energy dispersive spectroscopy was used to study the distribution of metal ions in the resin matrix. It could be tentatively concluded that adsorption and diffusion of metal ions in the chelating resins mainly depended on the loading of the resin matrix which indicated interacting sites with metal ions.

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